/* ==========================================================================
   沃尔玛风格 - 现代简约设计系统
   Modern Minimalist Design System inspired by Walmart
   ========================================================================== */

/* CSS变量定义 - 沃尔玛品牌色彩系统 */
:root {
  /* 沃尔玛主品牌色 - Walmart Blue */
  --acn-primary: #1976D2;        /* 沃尔玛主蓝色 */
  --acn-primary-light: #42A5F5;  /* 沃尔玛浅蓝色 */
  --acn-primary-dark: #1565C0;   /* 沃尔玛深蓝色 */
  --acn-primary-bg: rgba(25, 118, 210, 0.08);
  --acn-primary-hover: rgba(25, 118, 210, 0.12);

  /* 沃尔玛黄色 - Walmart Yellow */
  --acn-secondary: #ffc220;      /* 沃尔玛标志黄色 */
  --acn-secondary-light: #ffcc40; /* 沃尔玛浅黄色 */
  --acn-secondary-dark: #e6a91a;  /* 沃尔玛深黄色 */
  --acn-secondary-bg: rgba(255, 194, 32, 0.08);

  /* 功能色 - Status Colors */
  --acn-success: #137333;        /* 沃尔玛成功绿色 */
  --acn-success-light: #34a853;
  --acn-success-bg: rgba(19, 115, 51, 0.08);

  --acn-warning: #f9ab00;        /* 沃尔玛警告橙色 */
  --acn-warning-light: #fbbc04;
  --acn-warning-bg: rgba(249, 171, 0, 0.08);

  --acn-danger: #d93025;         /* 沃尔玛错误红色 */
  --acn-danger-light: #ea4335;
  --acn-danger-bg: rgba(217, 48, 37, 0.08);

  --acn-info: #0071ce;           /* 沃尔玛信息蓝色 */
  --acn-info-light: #4285f4;
  --acn-info-bg: rgba(0, 113, 206, 0.08);

  /* 中性色 - Neutral Palette (保持现代感) */
  --acn-white: #ffffff;
  --acn-gray-50: #f8f9fa;
  --acn-gray-100: #f1f3f4;
  --acn-gray-200: #e8eaed;
  --acn-gray-300: #dadce0;
  --acn-gray-400: #bdc1c6;
  --acn-gray-500: #9aa0a6;
  --acn-gray-600: #80868b;
  --acn-gray-700: #5f6368;
  --acn-gray-800: #3c4043;
  --acn-gray-900: #202124;

  /* 背景色 - Modern Light Theme */
  --acn-bg-primary: #f8f9fa;     /* 沃尔玛浅灰背景 */
  --acn-bg-secondary: #f1f3f4;
  --acn-bg-dark: #1a1a1a;
  --acn-bg-card: #ffffff;
  --acn-bg-overlay: rgba(0, 0, 0, 0.5);

  /* 文字色 - Typography */
  --acn-text-primary: #202124;
  --acn-text-secondary: #5f6368;
  --acn-text-tertiary: #9aa0a6;
  --acn-text-inverse: #ffffff;
  --acn-text-link: var(--acn-primary);
  --acn-text-link-hover: var(--acn-primary-dark);

  /* 边框色 - Borders */
  --acn-border-light: #e8eaed;
  --acn-border-medium: #dadce0;
  --acn-border-dark: #80868b;

  /* 阴影 - Subtle Shadows for Modern Design */
  --acn-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --acn-shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
  --acn-shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.12);
  --acn-shadow-none: none;

  /* 间距系统 - Spacing Scale */
  --acn-space-xs: 4px;
  --acn-space-sm: 8px;
  --acn-space-md: 16px;
  --acn-space-lg: 24px;
  --acn-space-xl: 32px;
  --acn-space-2xl: 48px;
  --acn-space-3xl: 64px;
  --acn-space-4xl: 80px;

  /* 圆角 - Minimal Border Radius */
  --acn-radius-none: 0;
  --acn-radius-sm: 4px;
  --acn-radius-md: 8px;
  --acn-radius-lg: 12px;
  --acn-radius-xl: 16px;
  --acn-radius-full: 50%;

  /* 动画 - Smooth Micro-interactions */
  --acn-transition-fast: 0.15s;
  --acn-transition-normal: 0.25s;
  --acn-transition-slow: 0.35s;
  --acn-ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --acn-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);

  /* 字体系统 - Typography */
  --acn-font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --acn-font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;

  /* 字体大小 */
  --acn-text-xs: 12px;
  --acn-text-sm: 14px;
  --acn-text-base: 16px;
  --acn-text-lg: 18px;
  --acn-text-xl: 20px;
  --acn-text-2xl: 24px;
  --acn-text-3xl: 30px;
  --acn-text-4xl: 36px;

  /* 字体粗细 */
  --acn-font-light: 300;
  --acn-font-normal: 400;
  --acn-font-medium: 500;
  --acn-font-semibold: 600;
  --acn-font-bold: 700;

  /* 行高 */
  --acn-leading-tight: 1.25;
  --acn-leading-normal: 1.5;
  --acn-leading-relaxed: 1.75;

  /* 断点 - Responsive Breakpoints */
  --acn-breakpoint-sm: 640px;
  --acn-breakpoint-md: 768px;
  --acn-breakpoint-lg: 1024px;
  --acn-breakpoint-xl: 1280px;

  /* Z-index层级 */
  --acn-z-base: 0;
  --acn-z-dropdown: 1000;
  --acn-z-sticky: 1020;
  --acn-z-fixed: 1030;
  --acn-z-modal: 10000;
  --acn-z-popover: 1050;
  --acn-z-tooltip: 1060;
  --acn-z-toast: 9999;
}

/* ==========================================================================
   全局基础样式 - Modern Reset + Accenture Aesthetics
   ========================================================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  scroll-behavior: smooth;
}

html,
body {
  font-family: var(--acn-font-family);
  background-color: var(--acn-bg-primary);
  color: var(--acn-text-primary);
  line-height: var(--acn-leading-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 链接样式 */
a {
  color: var(--acn-text-link);
  text-decoration: none;
  transition: color var(--acn-transition-normal) var(--acn-ease-out);
}

a:hover {
  color: var(--acn-text-link-hover);
}

a:focus {
  outline: 2px solid var(--acn-primary);
  outline-offset: 2px;
}

/* 表单元素基础样式 */
input,
textarea,
select,
button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  transition: all var(--acn-transition-normal) var(--acn-ease-out);
}

button:focus {
  outline: 2px solid var(--acn-primary);
  outline-offset: 2px;
}

/* 图片优化 */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ==========================================================================
   文字颜色工具类
   ========================================================================== */

.text-primary { color: var(--acn-text-primary); }
.text-secondary { color: var(--acn-text-secondary); }
.text-success { color: var(--acn-success); }
.text-warning { color: var(--acn-warning); }
.text-danger { color: var(--acn-danger); }
.text-info { color: var(--acn-info); }

/* ==========================================================================
   加载遮罩 - Modern Overlay
   ========================================================================== */

.loading-mask {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--acn-bg-overlay);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--acn-z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--acn-transition-normal) var(--acn-ease-out);
}

.loading-mask.show {
  opacity: 1;
  visibility: visible;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--acn-gray-300);
  border-top-color: var(--acn-primary);
  border-radius: var(--acn-radius-full);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ==========================================================================
   底部导航栏 - 沃尔玛风格现代导航
   ========================================================================== */

.nav-bar {
  position: fixed !important;
  bottom: 0 !important;
  left: 0 !important;
  right: 0 !important;
  height: 70px !important;
  background-color: rgba(255, 255, 255, 0.95) !important;
  backdrop-filter: blur(20px) !important;
  -webkit-backdrop-filter: blur(20px) !important;
  border-top: 1px solid rgba(255, 255, 255, 0.3) !important;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15) !important;
  z-index: 9999 !important; /* 确保导航栏始终在最顶层 */
  display: flex !important;
  align-items: center !important;
  justify-content: space-around !important;
  padding: 0 var(--acn-space-md) !important;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--acn-space-md);
  color: var(--acn-text-secondary);
  font-size: var(--acn-text-xs);
  font-weight: var(--acn-font-medium);
  transition: all 0.2s ease;
  cursor: pointer;
  position: relative;
  text-decoration: none;
  min-width: 64px;
  min-height: 48px;
  border-radius: var(--acn-radius-md);
  gap: var(--acn-space-xs);
}

.nav-item:hover {
  background-color: rgba(0, 76, 145, 0.05);
  color: var(--acn-primary);
  transform: translateY(-1px);
}

.nav-item.active {
  color: white;
  background-color: var(--acn-primary);
  border-radius: var(--acn-radius-md);
}

.nav-item.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 2px;
  background-color: var(--acn-primary);
  border-radius: var(--acn-radius-sm) var(--acn-radius-sm) 0 0;
  transition: all 0.3s ease;
  display: none; /* 隐藏底部指示条，因为现在有蓝色背景 */
}

.nav-item::before {
  content: '';
  width: 28px;
  height: 28px;
  background-color: currentColor;
  -webkit-mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-position: center;
  mask-size: contain;
  mask-repeat: no-repeat;
  mask-position: center;
  transition: all var(--acn-transition-normal) var(--acn-ease-out);
}

.nav-item.active::before {
  width: 28px;
  height: 28px;
  transform: none;
}

.nav-item span {
  display: none;
}

/* 导航图标样式 */
.nav-home::before { 
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  mask-image: url("data:image/svg+xml,%3Csvg t='1754289210588' viewBox='0 0 1024 1024' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M518.54848 356.28032c20.7616 0 36.33664-12.11392 39.79264-29.4144l20.7616-268.18048C579.10784 31.0016 551.424 10.24 518.54848 10.24s-60.55936 20.7616-60.55936 48.44544l20.7616 268.18048c1.73568 15.57504 17.3056 29.4144 39.79776 29.4144zM380.1344 434.14016c12.11392-20.7616 12.11392-41.5232-1.73056-50.176L163.85536 240.3584c-22.49216-12.11392-55.36768 1.73056-74.39872 34.60608-19.03104 29.4144-15.56992 65.74592 5.19168 77.85984l237.04064 105.54368c19.03104 6.91712 38.06208-3.46624 48.44544-24.22784z m276.83328 0c12.11392 20.7616 32.87552 29.4144 46.71488 24.22272l237.04064-105.54368c22.49216-12.11392 24.22272-46.71488 5.19168-77.85984s-53.63712-46.71488-74.39872-34.60608l-214.54336 143.60576c-12.11904 10.38848-12.11904 32.88064-0.00512 50.18112z m-138.4192 233.57952c20.7616 0 36.33664 12.11392 39.79264 29.4144l20.7616 268.18048c0 27.68384-27.68384 48.44544-60.55936 48.44544s-60.55936-20.7616-60.55936-48.44544l20.7616-268.18048c1.7408-17.3056 17.31072-29.4144 39.80288-29.4144z m138.4192-60.55936c12.11392-20.7616 32.87552-29.4144 46.71488-24.22272l237.04064 105.54368c22.49216 12.11392 24.22272 48.44544 5.19168 79.5904-19.03104 31.14496-53.63712 44.98432-74.39872 34.60608l-214.54336-145.33632c-12.11904-8.6528-12.11904-31.15008-0.00512-50.18112z m-276.83328 0c12.11392 20.7616 12.11392 41.5232-1.73056 51.90656l-214.54336 141.8752c-22.49216 12.11392-55.36768-1.73056-74.39872-34.60608-19.03104-31.14496-15.56992-67.47648 5.19168-77.85984l237.04064-105.54368c19.02592-5.18656 38.05696 5.1968 48.44032 24.22784z'/%3E%3C/svg%3E");
}

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/* ==========================================================================
   表单按钮 - Modern Button Design
   ========================================================================== */

.form-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--acn-space-md) var(--acn-space-xl);
  background-color: var(--acn-primary);
  color: var(--acn-white);
  border: 1px solid var(--acn-primary);
  border-radius: var(--acn-radius-md);
  font-size: var(--acn-text-base);
  font-weight: var(--acn-font-semibold);
  font-family: var(--acn-font-family);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--acn-transition-normal) var(--acn-ease-out);
  min-height: 48px;
  line-height: 1;
  gap: var(--acn-space-sm);
  box-shadow: var(--acn-shadow-none);
}

.form-button:hover {
  background-color: var(--acn-primary-dark);
  border-color: var(--acn-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--acn-shadow-md);
}

.form-button:active {
  transform: translateY(0);
}

.form-button:disabled {
  background-color: var(--acn-gray-400);
  border-color: var(--acn-gray-400);
  color: var(--acn-white);
  cursor: not-allowed;
  transform: none;
  box-shadow: var(--acn-shadow-none);
}

/* ==========================================================================
   Toast 消息提示 - Modern Notification System
   ========================================================================== */

.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-100%);
  background: var(--acn-bg-card);
  color: var(--acn-text-primary);
  padding: var(--acn-space-lg) var(--acn-space-xl);
  border-radius: var(--acn-radius-md);
  border: 1px solid var(--acn-border-light);
  box-shadow: var(--acn-shadow-lg);
  z-index: 10000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--acn-transition-normal) var(--acn-ease-out);
  max-width: 90%;
  text-align: center;
  font-weight: var(--acn-font-medium);
}

.toast.show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* Toast 类型样式 */
.toast.success {
  background: #4CAF50;
  color: white;
  border-color: #45a049;
}

.toast.error {
  background: #f44336;
  color: white;
  border-color: #d32f2f;
}

.toast.warning {
  background: #ff9800;
  color: white;
  border-color: #f57c00;
}

.toast.info {
  background: #2196F3;
  color: white;
  border-color: #1976D2;
}

/* ==========================================================================
   卡片组件 - Modern Card System
   ========================================================================== */

.card {
  background-color: var(--acn-bg-card);
  border-radius: var(--acn-radius-lg);
  box-shadow: var(--acn-shadow-sm);
  border: 1px solid var(--acn-border-light);
  overflow: hidden;
  transition: all var(--acn-transition-normal) var(--acn-ease-out);
  margin-bottom: var(--acn-space-lg);
}

.card:hover {
  box-shadow: var(--acn-shadow-md);
  transform: translateY(-2px);
}

.card-header {
  padding: var(--acn-space-lg);
  border-bottom: 1px solid var(--acn-border-light);
  background-color: var(--acn-bg-secondary);
}

.card-title {
  font-size: var(--acn-text-lg);
  font-weight: var(--acn-font-semibold);
  color: var(--acn-text-primary);
  margin: 0;
}

.card-body {
  padding: var(--acn-space-lg);
}

.card-footer {
  padding: var(--acn-space-lg);
  border-top: 1px solid var(--acn-border-light);
  background-color: var(--acn-bg-secondary);
}

/* ==========================================================================
   通用头部 - Modern Header Design
   ========================================================================== */

.header {
  height: 60px;
  background-color: var(--acn-bg-card);
  color: var(--acn-text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  border-bottom: 1px solid var(--acn-border-light);
  box-shadow: var(--acn-shadow-sm);
  z-index: var(--acn-z-sticky);
}

.header-content {
  width: 100%;
  max-width: 1200px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--acn-space-lg);
}

.title {
  font-size: var(--acn-text-xl);
  font-weight: var(--acn-font-semibold);
  color: var(--acn-text-primary);
  text-align: center;
  flex: 1;
}

.back-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--acn-radius-md);
  background-color: transparent;
  color: var(--acn-text-secondary);
  transition: all var(--acn-transition-normal) var(--acn-ease-out);
  cursor: pointer;
  border: 1px solid var(--acn-border-light);
}

.back-btn:hover {
  background-color: var(--acn-primary-bg);
  color: var(--acn-primary);
  border-color: var(--acn-primary);
}

.back-btn svg {
  width: 20px;
  height: 20px;
}

/* ==========================================================================
   现代页面布局系统
   ========================================================================== */

.page-container {
  min-height: 100vh;
  background-color: var(--acn-bg-primary);
  font-family: var(--acn-font-family);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--acn-space-lg);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--acn-space-lg);
}

.content-area {
  padding: var(--acn-space-xl) 0;
}

.content-section {
  margin-bottom: var(--acn-space-2xl);
}

/* ==========================================================================
   间距工具类
   ========================================================================== */

.mt-0 { margin-top: 0; }
.mt-xs { margin-top: var(--acn-space-xs); }
.mt-sm { margin-top: var(--acn-space-sm); }
.mt-md { margin-top: var(--acn-space-md); }
.mt-lg { margin-top: var(--acn-space-lg); }
.mt-xl { margin-top: var(--acn-space-xl); }

.mb-0 { margin-bottom: 0; }
.mb-xs { margin-bottom: var(--acn-space-xs); }
.mb-sm { margin-bottom: var(--acn-space-sm); }
.mb-md { margin-bottom: var(--acn-space-md); }
.mb-lg { margin-bottom: var(--acn-space-lg); }
.mb-xl { margin-bottom: var(--acn-space-xl); }

.p-0 { padding: 0; }
.p-xs { padding: var(--acn-space-xs); }
.p-sm { padding: var(--acn-space-sm); }
.p-md { padding: var(--acn-space-md); }
.p-lg { padding: var(--acn-space-lg); }
.p-xl { padding: var(--acn-space-xl); }

/* ==========================================================================
   Flexbox 工具类
   ========================================================================== */

.d-flex { display: flex; }
.flex-column { flex-direction: column; }
.flex-row { flex-direction: row; }
.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.align-start { align-items: flex-start; }
.align-center { align-items: center; }
.align-end { align-items: flex-end; }
.flex-1 { flex: 1; }
.flex-grow { flex-grow: 1; }
.flex-shrink { flex-shrink: 1; }

/* ==========================================================================
   现代按钮系统
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--acn-space-md) var(--acn-space-lg);
  border-radius: var(--acn-radius-md);
  font-size: var(--acn-text-base);
  font-weight: var(--acn-font-medium);
  font-family: var(--acn-font-family);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--acn-transition-normal) var(--acn-ease-out);
  border: 1px solid transparent;
  min-height: 44px;
  gap: var(--acn-space-sm);
  box-shadow: var(--acn-shadow-none);
  line-height: 1;
}

.btn:focus {
  outline: 2px solid var(--acn-primary);
  outline-offset: 2px;
}

/* 按钮尺寸 */
.btn-sm {
  padding: var(--acn-space-sm) var(--acn-space-md);
  font-size: var(--acn-text-sm);
  min-height: 36px;
}

.btn-lg {
  padding: var(--acn-space-lg) var(--acn-space-2xl);
  font-size: var(--acn-text-lg);
  min-height: 52px;
}

/* 按钮样式变体 */
.btn-primary {
  background-color: var(--acn-primary);
  color: var(--acn-white);
  border-color: var(--acn-primary);
}

.btn-primary:hover {
  background-color: var(--acn-primary-dark);
  border-color: var(--acn-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--acn-shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--acn-gray-100);
  color: var(--acn-text-primary);
  border-color: var(--acn-border-light);
}

.btn-secondary:hover {
  background-color: var(--acn-gray-200);
  border-color: var(--acn-border-medium);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--acn-primary);
  border-color: var(--acn-primary);
}

.btn-outline:hover {
  background-color: var(--acn-primary);
  color: var(--acn-white);
  transform: translateY(-1px);
}

.btn-ghost {
  background-color: transparent;
  color: var(--acn-text-secondary);
  border-color: transparent;
}

.btn-ghost:hover {
  background-color: var(--acn-gray-100);
  color: var(--acn-text-primary);
}

/* ==========================================================================
   现代表单系统
   ========================================================================== */

.form-group {
  margin-bottom: var(--acn-space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--acn-space-sm);
  font-size: var(--acn-text-sm);
  font-weight: var(--acn-font-medium);
  color: var(--acn-text-primary);
}

.form-control {
  width: 100%;
  padding: var(--acn-space-md);
  border: 1px solid var(--acn-border-light);
  border-radius: var(--acn-radius-md);
  background-color: var(--acn-bg-card);
  color: var(--acn-text-primary);
  font-size: var(--acn-text-base);
  font-family: var(--acn-font-family);
  transition: all var(--acn-transition-normal) var(--acn-ease-out);
  min-height: 44px;
}

.form-control:focus {
  border-color: var(--acn-primary);
  outline: none;
  box-shadow: 0 0 0 3px var(--acn-primary-bg);
}

.form-control::placeholder {
  color: var(--acn-text-tertiary);
}

/* 表单尺寸 */
.form-control-sm {
  padding: var(--acn-space-sm) var(--acn-space-md);
  font-size: var(--acn-text-sm);
  min-height: 36px;
}

.form-control-lg {
  padding: var(--acn-space-lg);
  font-size: var(--acn-text-lg);
  min-height: 52px;
}

/* 表单验证状态 */
.form-control.is-valid {
  border-color: var(--acn-success);
}

.form-control.is-valid:focus {
  box-shadow: 0 0 0 3px var(--acn-success-bg);
}

.form-control.is-invalid {
  border-color: var(--acn-danger);
}

.form-control.is-invalid:focus {
  box-shadow: 0 0 0 3px var(--acn-danger-bg);
}

.form-control:disabled {
  background-color: var(--acn-gray-100);
  color: var(--acn-text-tertiary);
  cursor: not-allowed;
}

/* ==========================================================================
   现代列表系统
   ========================================================================== */

.list {
  background-color: var(--acn-bg-card);
  border-radius: var(--acn-radius-lg);
  border: 1px solid var(--acn-border-light);
  overflow: hidden;
  box-shadow: var(--acn-shadow-sm);
}

.list-item {
  padding: var(--acn-space-lg);
  border-bottom: 1px solid var(--acn-border-light);
  transition: all var(--acn-transition-normal) var(--acn-ease-out);
  cursor: pointer;
}

.list-item:hover {
  background-color: var(--acn-bg-secondary);
  transform: translateX(4px);
}

.list-item:last-child {
  border-bottom: none;
}

.list-item-content {
  display: flex;
  align-items: center;
  gap: var(--acn-space-md);
}

.list-item-title {
  font-size: var(--acn-text-base);
  font-weight: var(--acn-font-semibold);
  color: var(--acn-text-primary);
  margin-bottom: var(--acn-space-xs);
}

.list-item-subtitle {
  font-size: var(--acn-text-sm);
  color: var(--acn-text-secondary);
}

.list-item-meta {
  margin-left: auto;
  text-align: right;
}

.list-item-prefix {
  flex-shrink: 0;
}

.list-item-suffix {
  flex-shrink: 0;
  margin-left: auto;
}

.list-item-icon {
  width: 40px;
  height: 40px;
  background-color: var(--acn-primary-bg);
  color: var(--acn-primary);
  border-radius: var(--acn-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* ==========================================================================
   现代模态框系统
   ========================================================================== */

.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--acn-bg-overlay);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--acn-z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--acn-transition-normal) var(--acn-ease-out);
}

.modal.show {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background-color: var(--acn-bg-card);
  border-radius: var(--acn-radius-lg);
  box-shadow: var(--acn-shadow-lg);
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow: hidden;
  transform: scale(0.9);
  transition: transform var(--acn-transition-normal) var(--acn-ease-out);
}

.modal.show .modal-content {
  transform: scale(1);
}

.modal-header {
  padding: var(--acn-space-lg);
  border-bottom: 1px solid var(--acn-border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: var(--acn-text-lg);
  font-weight: var(--acn-font-semibold);
  color: var(--acn-text-primary);
  margin: 0;
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--acn-radius-md);
  background-color: transparent;
  color: var(--acn-text-secondary);
  border: 1px solid var(--acn-border-light);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--acn-transition-normal) var(--acn-ease-out);
}

.modal-close:hover {
  background-color: var(--acn-gray-100);
  color: var(--acn-text-primary);
}

.modal-body {
  padding: var(--acn-space-lg);
  max-height: 60vh;
  overflow-y: auto;
}

.modal-footer {
  padding: var(--acn-space-lg);
  border-top: 1px solid var(--acn-border-light);
  display: flex;
  gap: var(--acn-space-sm);
  justify-content: flex-end;
}

/* ==========================================================================
   空状态和加载状态
   ========================================================================== */

.empty-state {
  text-align: center;
  padding: var(--acn-space-4xl);
  color: var(--acn-text-secondary);
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--acn-space-lg);
  background-color: var(--acn-gray-100);
  border-radius: var(--acn-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--acn-text-tertiary);
}

.empty-state-title {
  font-size: var(--acn-text-xl);
  font-weight: var(--acn-font-semibold);
  color: var(--acn-text-primary);
  margin-bottom: var(--acn-space-sm);
}

.empty-state-text {
  font-size: var(--acn-text-base);
  line-height: var(--acn-leading-relaxed);
  margin-bottom: var(--acn-space-lg);
}

.empty-data {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--acn-space-4xl);
  text-align: center;
  color: var(--acn-text-secondary);
}

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--acn-space-4xl);
}

/* ==========================================================================
   响应式设计工具类
   ========================================================================== */

.hidden { display: none; }
.visible { display: block; }

/* 移动端显隐 */
.hidden-mobile { display: none; }
.visible-mobile { display: block; }

.hidden-desktop { display: block; }
.visible-desktop { display: none; }

/* ==========================================================================
   响应式断点优化
   ========================================================================== */

/* 移动端优化 */
@media (max-width: 640px) {
  .container {
    padding: 0 var(--acn-space-md);
  }

  .hidden-mobile { display: none !important; }
  .visible-mobile { display: block !important; }

  .nav-bar {
    height: 60px;
  }

  .nav-item {
    min-width: 60px;
    font-size: 10px;
  }

  .nav-item::before {
    width: 20px;
    height: 20px;
  }

  .modal-content {
    width: 95%;
    margin: var(--acn-space-lg);
  }
}

/* 平板端优化 */
@media (min-width: 641px) and (max-width: 768px) {
  .nav-item {
    min-width: 70px;
  }
}

/* 桌面端优化 */
@media (min-width: 1024px) {
  .hidden-desktop { display: none !important; }
  .visible-desktop { display: block !important; }

  .container {
    padding: 0 var(--acn-space-xl);
  }

  .form-control {
    font-size: var(--acn-text-base);
  }
}

/* ==========================================================================
   优化的微交互和动画
   ========================================================================== */

/* 平滑滚动 */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

/* 悬停提升效果 */
.hover-lift {
  transition: transform var(--acn-transition-normal) var(--acn-ease-out);
}

.hover-lift:hover {
  transform: translateY(-2px);
}

/* 按压效果 */
.press-effect {
  transition: transform var(--acn-transition-fast) var(--acn-ease-out);
}

.press-effect:active {
  transform: translateY(1px);
}

/* 淡入动画 */
.fade-in {
  animation: fadeIn var(--acn-transition-slow) var(--acn-ease-out);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 滑入动画 */
.slide-in {
  animation: slideIn var(--acn-transition-slow) var(--acn-ease-out);
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

/* ==========================================================================
   无障碍和可用性优化
   ========================================================================== */

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
  :root {
    --acn-border-light: #999999;
    --acn-border-medium: #666666;
    --acn-text-secondary: #444444;
  }
}

/* 减少动画模式支持 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* 焦点可见性 */
.focus-visible {
  outline: 2px solid var(--acn-primary);
  outline-offset: 2px;
}

/* 触摸设备优化 */
@media (pointer: coarse) {
  .btn,
  .nav-item,
  .form-control {
    min-height: 44px;
  }
}

/* 返回按钮统一样式 */
.back-button {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  background-color: var(--acn-primary);
  border: none;
  border-radius: var(--acn-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--acn-transition-normal) var(--acn-ease-out);
  box-shadow: var(--acn-shadow-sm);
  z-index: 10;
}

.back-button:hover {
  background-color: var(--acn-primary-dark);
  box-shadow: var(--acn-shadow-md);
  transform: translateY(-50%) scale(1.05);
}

.back-button:active {
  transform: translateY(-50%) scale(0.95);
}

.back-button svg {
  width: 20px;
  height: 20px;
  color: var(--acn-white);
  transition: transform var(--acn-transition-fast) var(--acn-ease-out);
}

.back-button:hover svg {
  transform: translateX(-1px);
}

/* 确保头部容器有相对定位 */
.header,
.page-header {
  position: relative;
}

/* 调整标题样式以适配返回按钮 */
.header .title,
.page-header .page-title h1,
.page-header .header-title h1 {
  text-align: center;
  width: 100%;
  padding-left: 56px; /* 为返回按钮留出空间 */
  box-sizing: border-box;
}